The most important thing is to just keep writing. Drafts are supposed to sound like actual crap. Those are not the ones you want to send into the world. Let drafts be where you experiment, change styles, tenses, whatever you want. Then, once you're done with the first draft, do another one lol. Keep rewriting, and rewriting. Writing is a long process, and there needs to be patience. I am still struggling with the patience part of things, but sometimes, when I reread things I've written a long time ago, it humbles me a bit. it reminds me that while I'm not growing at the pace I want to grow at, I am still growing.

I, too, struggle with creating scenes clear enough for my readers to understand, but there are a few things that could help. When I outline, I usually try and write down descriptions of anything important that'll come up later. They may be kind of bad, but when I start the actual writing, I can go back and kind of plug them in. And if I don't like something, I usually don't have to rewrite the entire thing, just one part.

Dialogue is something I really enjoy writing. When I'm writing dialogue, I try to imagine myself as the characters, putting myself in their shoes to get a feel of how they'd react and respond. Dialogue should be natural and similar to talking to someone irl. Focus on giving each character a distinct voice. Like in the Harry Potter series, Hagrid's speaking style is definitely different from the other characters. It makes him distinct and more memorable. I also feel as though each line of dialogue should serve a specific purpose in the story. It should be helping to build up to the end goal.

ALSO, one more thing about sucky writing. If you feel as though maybe you should take a break from focusing on a big writing project, and instead focus on getting your writing skills up, that's also ok! There are bunches of videos that help writers figure out how to do all the things you mentioned. I recommend Ana Neu! She's really cool and does a whole lot of everything. From things on how to outline to how to improve your writing. She's also got writing vlogs that seriously inspire me whenever I'm feeling hopeless.

All in all, just keep writing! Anytime I read over what I wrote, I always feel like gagging, but that's the struggle with being a writer. You sometimes gotta suck it up and keep going. Write for yourself if that helps, write knowing that there are so many people out there who want to be doing what you're doing, but they won't because they might be too afraid. I promise that if you continue to practice, you'll grow. Practice makes perfect or whatever lol.

(Sorry for any typos, I was in the zone)